<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="https://unpkg.com/vue-router/dist/vue-router.js"></script>
    <script src="https://unpkg.com/vuex@3.6.2/dist/vuex.js"></script>
    <title>Document</title>
</head>

<body>
    <div id="app">
        通過id搜索：
        <input type="text" v-model="id">
        <button @click="search">搜索</button>
        <button @click="addWindow">添加</button>
        <p v-if="addFlag">
            id：<input type="text" v-model="addtodo.id">
            text：<input type="text" v-model="addtodo.text">
            <input @click="add" type="button" value="确定">
            <input type="button" @click="addclose" value="取消">
        </p>
        <p v-if="modifyFlag">
            id：<input type="text" v-model="modifytodo.id">
            text：<input type="text" v-model="modifytodo.text">
            <input @click="modify" type="button" value="修改">
            <input type="button" @click="modifyclose" value="取消">
        </p>
        <p>搜索结果：</p>
        <template v-for="item1 in this.$store.getters.search">
            {{item1}}
            <button @click="modifyWindow(item1)">修改</button>
            <button @click="dirDel(item1)">删除</button>
        </template>
        <br></br>
        <p>所有数据：</p>
        <ul>
            <li v-for="(item,index) in this.$store.state.todos" :key='index'>{{item}} 
                <button @click="modifyWindow(item)">修改</button>
                <button @click="del(index)">删除</button>
            </li>
        </ul>
    </div>
</body>

<script>
    const store = new Vuex.Store({
        state: {
            todos: [
                { id: 1, text: '列表1' },
                { id: 2, text: '列表2' }
            ],
            id: 0,
        },
        // 同步
        mutations: {
            search(state, id) {
                state.id = id
            },
            add(state,todo){
                state.todos.push(todo)
            },
            del(state,index){
                state.todos.splice(index,1)
            },
            modify(state,list){
                for(var i=0;i<state.todos.length;i++){
                    if(list[0].id == state.todos[i].id && list[0].text == state.todos[i].text){
                        console.log(list[1])
                        state.todos[i].id = list[1].id;
                        state.todos[i].text = list[1].text;
                        console.log(state.todos)
                        return;
                    }
                }
            }
        },
        // 异步
        actions:{
            del({commit},index){
                commit('del',index)
            },
            modify({commit},list){
                commit('modify',list)
            },
        },
        getters: {
            search: state => {
                return state.todos.filter(todo => todo.id == state.id)
            },
        }
    })

    var vm = new Vue({
        el: '#app',
        data: {
            id: '',
            addFlag : false,
            modifyFlag :false,
            addtodo : {
                id :"",
                text : ""
            },
            //所修改的数据
            modifytodo : {
                id :"",
                text : ""
            },
            //修改前的数据
            inittodo : {
                id :"",
                text : ""
            },
        },
        store,
        methods: {
            search() {
                this.$store.commit('search', this.id);
            },
            del(index){
                console.log(index)
                this.$store.dispatch('del',index)
            },
            modifyWindow(item){
                this.modifytodo.id = item.id,
                this.modifytodo.text = item.text
                this.inittodo.id = item.id;
                this.inittodo.text = item.text,
                this.modifyFlag = true;
            },
            modify(){
                //参数需以列表形式传入否则无法读取
                this.$store.dispatch('modify',[this.inittodo,this.modifytodo])
                this.modifyFlag = false;    
            },
            modifyclose(){
                this.modifyFlag = false;
            },
            addWindow(){
                this.addFlag = true;
                this.addtodo.id = "";
                this.addtodo.text = ""
            },
            addclose(){
                this.addFlag = false;
            },
            add(){
                this.addFlag = false;            
                this.$store.commit('add',this.addtodo)
            },
            //寻找要删除的位置
            dirDel(item1){
                for(var i = 0;i<this.$store.state.todos.length;i++){
                    if(this.$store.state.todos[i] == item1){
                        this.del(i);
                        return;
                    }
                }
            }
        }
    })
</script>

</html>
